/*
*
* Copyright (c) 2011 Vaulting Systems International
* 
* Permission is hereby granted, free of charge, to any person obtaining a copy 
* of this software and associated documentation files (the "Software"), to deal 
* in the Software without restriction, including without limitation the rights 
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 
* of the Software, and to permit persons to whom the Software is furnished to do  
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all  
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE  
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
package com.ekeyman.securesave.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

import org.apache.commons.codec.digest.DigestUtils;

public class DigitalSignature {
	
	/*
	 * Creates a digital signature that is used to verify web service requests.
	 */
	public static String createDigitalSignature(String...strings){
		String ds = "";
		
		for(String s: strings){
			ds += s;
		}
		
		return DigestUtils.md5Hex(ds);
	}
	
	
	/*
	 * Creates a digital signature that is used to verify web service requests.
	 */
	public static String createDigitalSignature(InputStream is) throws Exception{
		String signature = "";
		try{
			signature =  DigestUtils.md5Hex(is);
		}
		catch(Exception e){
			throw e;
		}
		finally{
			if(is != null){
				is.close();
			}
		}
		return signature;
	}
	
	/*
	 * Creates a digital signature that is used to verify web service requests.
	 */
	public static String createDigitalSignature(File file) throws Exception {
		InputStream is = new FileInputStream(file);
		return createDigitalSignature(is);
	}
}
